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115=7x+9
We move all terms to the left:
115-(7x+9)=0
We get rid of parentheses
-7x-9+115=0
We add all the numbers together, and all the variables
-7x+106=0
We move all terms containing x to the left, all other terms to the right
-7x=-106
x=-106/-7
x=15+1/7
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